DESIGN & DEVELOPMENT OF PROGRAMMABLE SYSTEM ON CHIP TO MEASURE ENVIRONMENTAL PARAMETERS OF POLYHOUSE

2. By
A . S. Powar & M . S . Salunkhe
Guide
Dr. B. P. Ladgaonkar
Prof. S. K.Tilekar
VLSI Design and Research Center
Post Graduate Department of Electronics
Shankarrao Mohite Mahavidyalaya, Akluj
Tal - Malshiras , Dist. - Solapur – 413 101

3. 1. Introduction
A) Origin of the Problem
B) Aim & Objectives
2. Designing of the System
Hardware Co-design
3. Result and Discussion
4. Conclusion

4.  It is found that, the humidity, CO2 in the polyhouse is not
measured precisely with the help of unskilled person.
 This may adversely affect the yield of the crops.
 Therefore, it is found that this agriculture field is mostly
demanding the sophisticated instrument to monitor the
parameters of polyhouse.
 Hence considering this fact and the social demands, it is
proposed to develop an electronic system to measure the
environmental parameters of polyhouse.

5.  To study the architectural details of PSoC1.
 To study the PSoC designer IDE.
 To configure the hardware using PSoC1.
 Co development of necessary software.
 Implementation of the system.
 Interpretation of result.

6. Polyhouse or Green house provides a controlled and
favourable environment for the crops to grow in all
seasons. The important parameters are:
Humidity
CO2

7. Weak
analog Buffer Amplifier ADC FPGA
signal

8. Weak analog
signals PSoC
P rogrammable
S ystem
o n
C hip

9. Block Diagram.
Configuration blocks for our
system.

10. CO2 sensor (MG-
811) & PSoC 1 Device LCD
Humidity sensor
CY8C29466 -
(SY-HS-220)
24PXI

11. 1) Humidity sensor(SY-HS-220).
2) CO2 sensor(MG-811).

12. Features:-
1)Highly precise and
reliable.
2)Exhibit linearity over
30%
Rh to 95 % Rh.
3)The humidity sensor is
of
Capacitive type.
4)Provides DC output
voltage.

13. Features:-
1)Good sensitivity and
selectivity to CO2
2)Low humidity and
temperature
dependency.
3)Long stability and
reproducibility.

14. Overall chemical reaction：Li2CO3 + 2Na + = Na2O + 2Li + + CO2
EMF = Ec - (R x T) / (2F) ln (P(CO2))
Where, P(CO2) - CO2 partial Pressure, Ec - Constant Volume, R - Gas
Constant volume, T - Absolute Temperature (K), F- Faraday constant

15. PSoC Device Features:
• Configurable Analog Blocks
Implement ADCs, DACs, filters,
amplifiers,
comparators, etc.
• Configurable Digital Blocks
Implement timers, counters, PWMs,
UART, SPI, IrDA, etc.
• 4KB to 32KB of Flash memory for
program storage
• 256B to 2KB of SRAM for data storage
• M8C Microcontroller: 4 Million
Instructions Per Sec

16. Inputs :
 Each pin can sink 25mA
 Programmable filters
 Flexible sensor interface I/O
 3 types of ADCs, up to 4
Processing :
 Fast M8 Microcontroller Core
 Multiply Accumulate
Outputs :
 Each pin can source 10mA
 Up to 16 PWMs, Timers, Counters
 Up to 9-bit DACs, 14-bit ADCs
Support Functions :
 EEPROM
 Sleep Options
 Watch Dog Timer
 Low voltage detect

24. i = V/R
Q = CV
I average = Q/T = Qfs = CVfs
R equivalent = V/I average = 1/Cfs

26.  Determine system requirements
 Choose User Modules
 Place User Modules
 Set global and User Module parameters
 Define the pin-out for the device
 Generate the application
 Review generated code
 Demonstrate working configuration

32. ADCINCVR
LCD
PGA

33. Block Diagram of ADCINCVR

34. Vo =(VIN –VGND).(Ra/Ra+Rb)+VGND

36. B) Application programme routine
A) Boot programme algorithm Void main()
{
Start system timers;
Execute boot program: Initialise application specific
--initialise general purpose resources; modules;
--configure application specific Initialise global variables;
modules; Initialise application specific
--initialise run time environment; channels;
--disable interrupt; Enable interrupts;
call main application routine; While(1)
{
Wait for events(Enabled interrupts);
Read values from input channels;
Execute control
procedure & compute
actuation data;
output actuation data to output
channels;
}
}

37. Start
Initialization of
all modules
Get ADC reading
SoftwareHumidity for Flow Of
Design
Calibrate data
Our System
Convert in ASCII
Display reading
Get reading for CO2
If
count<0x65(
Yes 200mv) No
Display as Undetected Display as Detected
STOP

38. A
Initialize ADC1
NO
When ADC 1
Data Available
YES
Calibrate the Data
Convert in to ASCII
Display
B

39. B
Initialize ADC2
When ADC
2 Data
Available
YES
If Count
<0x65(200m
v)
NO
Display as Display as
Undetected Detected
Return Return

40. c
Initialize LCD
Set LCD Position
Send Data To
Disply
Return

42. Humidity(%Rh) Output(mV)
120
30 794
35 860
100
40 958 y = 0.0288x + 11.315
45 1092 80
50 1258
55 1458 60 Series1
60 1709 Linear (Series1)
65 1894 40
70 2064
75 2224 20
80 2383
85 2547 0
0 1000 2000 3000 4000
90 2729
95 2935

48. System is designed for measurement of humidity and CO2 gas
The humidity observations shown by the system are highly reliable and
precise. Moreover, the presence of CO2 gas is also exhibited by the
present system.
System works successfully and gives the data regarding environmental
parameters very precisely.

49. Particularly for measurement of carbon
dioxide (CO2) gas concentration, the
calibration in the respective units is
required. However, presently due to
unavailability of CO2 gas chamber the
calibration of carbon dioxide gas
concentration is left as future work.